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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h1>表单测试案例</h1>
    <form action="">
        姓名：<input type="text" name="" id="" placeholder="请输入你的年龄" required><br>
        年龄：<input type="number" placeholder="请输入你的年龄" readonly><br>
        手机：<input type="tel" name="" id="" placeholder="请输入你的手机号"><br>
        头像：<input type="file" name="" id="" accept="image/*"><br>
        <input type="submit" value="提交">
        <input type="reset" value="重置">
    </form>
</body>
</html>